Global variable to capture the username with Form 6i

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  Hello
  
  It's his practice use? :
  

  public abstract class Base {
      private int importantPrivateVariable = setImportantPrivateVariable();
      protected abstract int setImportantPrivateVariable();
  }

  I want to apply the extension of the class to define a private variable, but there is no variable abstract in java, I can use a method for that.
  
  Thank you
  lemonboston
  
  Edit: the variable can be protected as well, I guess that's not important here, but correct me if I'm wrong

  lemonboston wrote:
  Hello

  It's his practice use? :

  I don't think it's so common, but it's easily understandable code. However, there are several problems with this approach:

  public abstract class Base {
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  protected abstract int setImportantPrivateVariable();
  }
  

  I want to apply the extension of the class to define a private variable

  This is some what your code implements: your base class requires the subclasses to return an int value, and the Base class uses this value to assign to the variable.

  Therefore, the method should be called to (for example getInitialValueOfImportantVariable()+ to have a consistent naming with his signature (it returns a value, whereas a regular setter must declare a void return type: protected abstract void setImportantPrivateVariable (int someValue);).)

  Edit: the variable can be protected as well, I guess that's not important here.

  Well, Yes, it is 'important' - at least, there is a noticeable difference: the variable is private, the base class is free to treat it as seems it (for example, assign the value at construction time and never change it later). If the variable was protected, the subclass could change in ways and at times not known by the base class.

  but correct me if I'm wrong

  There is a trap in this construction: the method is called in the variable initializer, i.e., behind the scenes, about during execution of the Base, so before the constructor of the sub-class class constructor. For example, you call a method on an object that is not completely initialized (for example some of its attributes may always be null at this point). There is a rule that discourages this kind of situation, which goes something like "no calling private and unofficial constructor methods.

  To avoid this trap, two options:
  -requires an int argument in the constructor of the Base class, as suggested above
  -Don't be and set the value of the important variable in the code of the initializer or the constructor, but a special method in the base class instead:

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      private int importantPrivateVariable; // default value is zero
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      protected abstract int getImportantPrivateVariable();
  
      public void initializeImportantPrivateVariable() {
          importantPrivateVariable = getImportantPrivateVariable();
      }
  }
  

  This construction is a degenerate form of a common model known as the model method (where a base class method calls usually several methods of the subclass in a specified order and with a specified sequence, allowing for the subclass to implement the details of the methods).

  The downside is that the client code (the one that uses the Base instance) must know when to call this initialization method, while initialization, a constructor-based allows the free client code of don't like do not at all.

  Much luck,

  J.

• Can I use a global variable to determine the event?

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  For example,.

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  Kind regards

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• Bind variables (how replace the placeholders with the same value?)

  Hello, I have a code like this:
  

    procedure getAllTasks(o_cursor                      in out PKG_APPLICATION.rc,
                          in_filter_project_id          in T_FCT_TASK.project_id%type default -1,
                          in_filter_scope_id            in T_FCT_TASK.scope_id%type default -1,
                          in_filter_user_creator_id     in T_FCT_TASK.user_creator_id%type default -1,
                          in_filter_priority_id         in T_HST_TASK.priority_id%type default -1,
                          in_filter_status_id           in T_HST_TASK.status_id%type default -1,
                          in_filter_user_responsible_id in T_HST_TASK.user_responsible_id%type default -1,
                          in_pagination_first           in integer,
                          in_pagination_last            in integer) is
      v_query varchar2(4000) := v_query_allTasks || v_query_whereFilter;
    begin
      PKG_APPLICATION.setPagination(v_query);
    
      PKG_LOG.debug('query: ' || v_query, PCK);
    
      open o_cursor for v_query
        using in_filter_project_id, in_filter_scope_id, in_filter_user_creator_id, in_filter_priority_id, in_filter_status_id, in_filter_user_responsible_id, in_pagination_last, in_pagination_first;
    end;

  The variable v_query contains:

  SELECT * FROM (SELECT A.*, ROWNUM AS RNUM
                    FROM (
      SELECT task_id, project_id, project_name, scope_id, scope_name, user_creator_id, user_creator_login, title, description,
             priority_id, priority_name, status_id, status_name, user_responsible_id, user_responsible_login, due_date,
             last_modified_by_id, last_modified_by_login, last_modified
        FROM V_FCT_TASK
      WHERE project_id          = decode(:1, -1, project_id, :1)
        and scope_id            = decode(:2, -1, scope_id, :2)   
        and user_creator_id     = decode(:3, -1, user_creator_id, :3)   
        and priority_id         = decode(:4, -1, priority_id, :4)   
        and status_id           = decode(:5, -1, status_id, :5)   
        and user_responsible_id = decode(:6, -1, user_responsible_id, :6)   
    ) A
                    WHERE ROWNUM <= :LAST)
              WHERE :FIRST <= RNUM

  Note that placeholders: 1: 2,...: 5 appears 2 times in the query.
  
  Is there a more elegant way to say that *: 1 * must be replaced by in_filter_project_id, *: 2 * by in_filter_scope_id without having twice in the USING clause these variables? If this is not the case, why the placeholders have name, if you can only refer to their position (order)?
  
  Thanks for all replies.

  Hi Adam,.

  text taken from http://download.oracle.com/docs/cd/B10501_01/appdev.920/a96624/11_dynam.htm

  Duplicate use of Placeholders

  Placeholders in a dynamic SQL statement associated with the arguments of bind in the USING clause of position, and not by name. Thus, if the same placeholder appears two times or more in the SQL statement, each appearance must correspond to a bind argument in the USING clause. For example, if the dynamic string

  sql_stmt := 'INSERT INTO payroll VALUES (:x, :x, :y, :x)';
  

  you could code the corresponding USING clause as follows:

  EXECUTE IMMEDIATE sql_stmt USING a, a, b, a;
  

  However, only the unique placeholders in a dynamic PL/SQL block are associated with bind arguments in the USING clause of position. Thus, if the same placeholder appears two times or more in a PL/SQL block, all appearances correspond to a single argument to bind in the USING clause. In the example below, the first unique placeholder (x) is associated with the first bind argument (one). Similarly, the second unique space reserved (y) is associated with the second argument to bind (b).

  DECLARE
     a NUMBER := 4;
     b NUMBER := 7;
  BEGIN
     plsql_block := 'BEGIN calc_stats(:x, :x, :y, :x); END;'
     EXECUTE IMMEDIATE plsql_block USING a, b;
     ...
  END;
  

  Hope this helps
  Christian Balz

• Having problems capturing the image with 2 cameras and the PCIe-1430

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  This the error I get LabVIEW:

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  The IMAQ error

  Error 0xBFF60022

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• With the help of semaphore with a Global Variable - correct use?

  Hi all

  I looked in the use of global variables and in my case, it seemed with the help of a semaphore is the appropriate solution.

  In my case, I use a global variable to store the State of the system. Asynchronous two with screw environment (same VI) will follow two COM ports to see if they get a ' login:' command prompt. If the COM port is associated with Alpha, Charlie, or Echo, it increments by 1, and if it is associated with the Bravo, Delta, or Foxtrot, is incremented by 2 GV. If the GV is 3, the rest of the code will run. In this case, it must be a port COM A, C or E; the other should be B, D or F.

  A VI parent is called inside a loop. He works for the first loop. He never adds up to 3 on the second loop, however. I can't understand why. Please let me know if my code is a poor use of semaphores, or if there is debugging I can try.

  I'm still relatively new to LV, so I'm sorry if my screws are difficult to read. I created this in LV2011.

  Thanks for any help!

  CelerityEDS wrote:

  The output of my time looping (wait GV = 3) goes to the structure of the case on the bottom right (clear SGS, PasswordEntry, etc.), so the GV get indeed consulted by the upper case structure right.

  ??

  Your right upper case structure does not run until your time ends in a loop.  The while loop does not stop until the total is equal to 3.  Where can increment you the world besides structures case you cannot yet?

  Have you tried in your point culminating execution of the VI in order to see how they are actually running?

  Another problem that I see.  Assuming that your first while the loop is going to end.  In the structures of your case, you lock the semaphore.  But you can never unlock the semaphore unless you have the right combination of conditions that allow you to get to the case that unlocks the semaphore.  The conditions are based on data that are read before the start of the case of structure, which means that data will not be read and changed until it all ends.  You have the timeout of your lock semaphore connected on one of the cases, but your semaphore lock can never timeout because you do not have a value on his entry time-out.  I think you have a situation where you can lock a semaphore, then arrive at a situation where you can not unlock, then wind locking up of your cold code.

  I don't really think that you need a semaphore at all.  I think you can protect reading and writing functional your overall using a global variable, i.e. the motor action.  Overall, I think you need to rethink the architecture of your code.

• I don't get to use the global variable. Take a look in my form, please.

  Hello.

  I'm ashamed. I'm not able to use a base on the LiveCyle feature: Global Variable / object.

  I have a textfield for the user to put your name. Then, the user must click at the base. His name and value must be of value to a global variable, then I would use this value in any form.

  This look at my example I would use this value.

  https://Acrobat.com/#d=k0YlC1MXEdVTh1g2TXAJxw

  What is the error? I tried to put as a global variable, but it does not work.

  PS: Call of the value using textfield (TextField.rawValue = TextField2.rawValue), it works fine, but I prefer to use the variable

  Thank you very much.

  Hi Rafael,.

  I'm good thanks

  I do not know if I understood the question, but I think you're asking if it is possible to have a field that displays the value of a global variable (i.e. the 'view' you refer to), which is updated automatically via scripts of calculation or similar to but not dependent on another event, such as 'click '.

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  Help, please
  
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  Hello

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  I tried the htmldb_Get with her call for a process of application and without (null value). What I read, you should not need to call an application process to have the get.add of the value of the global variable. Here again, this could be where I'm wrong. However, as I mentioned, it works for the other functions called from an onchange to fill a part of the application, but the page has already loaded when the onchange (s) executed. They can work because the page is already loaded when the onchange is called. My point here is that my other on application processes are NOT set or modify global variables at all. The globals are preparing with the get.add (< element app >, < value >) part of my other JS works within the HTML header area. So I'm inclined to believe that I don't need 'application_process = < some_odp >' set parameter, but if it is not true, please let me know. If so, what should be in the application process-that is to say, what would be the purpose of the get.add (< application item >, < value >) if I set the global variable in the application process on because it's the only thing I could think to do within an application process on for this?
  
  If someone can point out what I'm not understand or, failing to do it here, that would be great. I am doing fine with APEX, but don't consider myself a guru with it immediately. I'm certainly not a JS/AJAX guru, and when things like that, go astray, I get bogged down because I'm not sure of the problem. So, I hope that you gurus who monitor this forum can get going in the right direction.
  
  Thank you
  Bob

  Hello

  Create page 0 (zero) to your application.
  Then try this javascript in your HTML page header

  BR, Jari

• Global variable in the progress bar

  I have an existing labview code that consists of a main vi, which is the GUI user, and several (about 70) under vi. I am trying to add a progress bar on the screen before (user GUI) which will be immediately after it hits certain sections of code. I write this using a global variable to store the value of the status and any attempt in the main on-screen progress bar after each increment. Is there a way to link the main progress bar value to the global variable so that it updates as soon as the value is incremented? The problem that I am facing is that when I update the global variable in a Subvi, the progress bar takes the value of the Sub - VI is finished, all the numbers to jump between the two. I know it's because I do not correctly write to the progress bar, but I don't know how to do. If this isn't a good method, are there any suggestions?

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  (I tried the Progress Bar Library OR offer, but I need a progress bar on the front panel, not a sound upward, so I can debug for code execution)

  Thank you - Adam

  I would go with a motor of Action update the progress bar VIA referance Server vi.  Here is an example of the use of a side effect I have to make this kind of progress bar.

  If you have not read Ben nugget of action engine, it should be mandatory, you can find here

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• Create the global variable

  I am new to animate. Please can you tell me how I can declare a global variable?

  I try to have a single button that plays the next 10 frames, another button that plays the next 20 images. I put the event listeners for the buttons on the first image. I'm putting the code on the timeline each 10 images that works if the game has to stop. I would like to connect with some global Boolean values. The project is the html canvas.

  It must be simple. Can you help me?

  Scope of variables in canvas mode:

  myVar = 1; variable is accessible everywhere in the current page

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  var myVar = 1; variable is accessible in the current context only

  So yes, the creation of a global variable is simple the most.